Mitsubishi Electric Melsec A Series - Page 148

REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4 - 7
4
(5) Performance comparison of AJ71BR11/A1SJ71BR11/ AJ71QBR11/A1SJ71QBR11 and
QJ71BR11 (MELSECNET/10 mode)
: Compatible, : Partial change required, ×: Incompatible
Item
Specifications
Compatibility Precautions for replacement
AJ71BR11
A1SJ71BR11
AJ71QBR11
A1SJ71QBR11
QJ72LP21G
(MELSECNET/10 mode)
Maximum
number of link
points per
network
LX/LY 8192 points
LB 8192 points
LW 8192 points
Maximum number of link
points per station
{(LY + LB)  8 + (2 × LW)} 2000 bytes
Communication speed 10Mbps
Communication method Token bus method
Synchronous type Frame synchronization method
Encoding method Manchester code
Transmission method Single bus
Transmission format HDLC standards (frame format)
Maximum number of
networks
255 (Total number
of PLC to PLC
networks and
remote I/O
networks)
239 (Total number of PLC to PLC networks
and remote I/O networks)
Network No.240 to No.250
cannot be set.
Alternate them with unused
network No.
Maximum number of
groups
9
Number of stations
connected in one network
32 stations (Control station: 1, normal station: 31)
Applicable cable 3C-2V, 5C-2V, 5C-FB
Overall distance
3C-2V: 300m
5C-2V, 5C-FB: 500m
Distance between
stations
3C-2V: 300m
5C-2V, 5C-FB: 500m
Error control system
CRC(X
16
+ X
12
+ X
5
+ 1) and retry by a time over
RAS function
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special
registers
• Network monitoring and various diagnostic functions
Transient transmission
• N:N communication (e.g. monitor, program up/download)
• Dedicated link instruction
For comparison of dedicated
link instruction, refer to
Section 4.6.2.
Number of occupied I/O
points
32 points per slot (I/O assignment:
special 32 points)
32 points per slot (I/O
assignment: intelli. 32
points)